muzzytt Posted September 28, 2012 Share Posted September 28, 2012 car runs fine, If I boost it through say first gear I grab second and it loses the urge to keep going for a couple of seconds even the exhaust sound changes then it clears up and away we go ! Ive cleaned the filter of the VVTI solenoid but cant rule that out . It almost always does it if I change gear after the second turbo has cone online If I change gears before 3800 this problem doesn't happen The car is fitted with blitz boost controller not sure if that's fitted correctly as ive just purchased the car! Quote Link to comment Share on other sites More sharing options...
V8KILR Posted September 28, 2012 Share Posted September 28, 2012 Try removing the boost controller and setting back to stock. Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 28, 2012 Author Share Posted September 28, 2012 I suppose its worth a try. I need to confirm wether or not its hooked up correctly I'll post a pic when I get home thanks Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 28, 2012 Author Share Posted September 28, 2012 I have to mention this does not happen all the time Quote Link to comment Share on other sites More sharing options...
mellonman Posted September 28, 2012 Share Posted September 28, 2012 this maybe a vsv problem have a read through this and see if it discribes what your getting http://mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted September 28, 2012 Share Posted September 28, 2012 Does sound like either the settings on the boost controller are wrong (have a look at the gain, if its set too high it might cause these symptoms. When do the turbos come online? Does it feel different to a stock?) or as said, it could be a vsv. Probably the egcv as it might not be spooling the second turbo properly. Do you get a problem during say a 3rd gear pull when both should come online or only when changing gear? Just thought, it also might be the pressure tank not holding pressure as it should. Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 28, 2012 Author Share Posted September 28, 2012 (edited) Just driving home after work I was in second gear I held second gear on quarter throttle when tacho reached 3800-4000 rpm the exhaust note changed and car seemed lethargic till revs dropped back down. I will get some more info on the boost controller and some pics of how its setup etc Thanks for suggestions so far Edited September 28, 2012 by muzzytt (see edit history) Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 28, 2012 Author Share Posted September 28, 2012 ok here is a pic of the boost controller and how its connected. I got pics of the egvc , also have good coating of oil in the intake and the pressurised pipes . I do think I had a bad pcv vlave wich i recently replaced with a new one. anyway back to this turbo issue and checked some of the pipes no slpits but its easy to spin some of them so theres possible leakage ? intake pipe going to turbo inlets Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 28, 2012 Author Share Posted September 28, 2012 the y pipe outlet to intercooler Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 29, 2012 Author Share Posted September 29, 2012 Re the boost controller. . The out is connected to one pipe going directly top the pressure tank under manifold, the. Actuators of the Turbos wastegate. Is this proper way of connecting? Also tested the two vsv Ay the front of engine with ohm meter all good also applied 12v and both work properly. Also did the same with the one right at the top near cam cover that's also good. I applied compressed air to egvc and the arm operates in and out. Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 29, 2012 Share Posted September 29, 2012 Just driving home after work I was in second gear I held second gear on quarter throttle when tacho reached 3800-4000 rpm the exhaust note changed and car seemed lethargic till revs dropped back down. That sounds like your Exhaust Gas Control Valve isn't opening. It's supposed to open around those rpms to let exhaust gas flow through the second turbo. If it doesn't, the 2nd tubby doesn't spin, and the boosted air from turbo #1 goes back out to atmosphere through the compressor side of turbo #2. You lose all boost, the engine goes flat. See here: http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 29, 2012 Author Share Posted September 29, 2012 That sounds like your Exhaust Gas Control Valve isn't opening. It's supposed to open around those rpms to let exhaust gas flow through the second turbo. If it doesn't, the 2nd tubby doesn't spin, and the boosted air from turbo #1 goes back out to atmosphere through the compressor side of turbo #2. You lose all boost, the engine goes flat. See here: http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system thats exactly how it feels. I think problem is intermittent and as car generally pulls hard problem only really happens when I back off throttle change gear its at this point the symptoms usually appear for a few seconds then you can hear it fix itself as the noise goes back to how it normally is . like i stated in an above post I tested the egvc with some comnpressed air and it freely moves in and out so that rules a mechanical issue with the actual valve. I also tested the vsv that feeds it and its is within spec, i also applied 12v to it and it opens and closes as it should. so the issue is furher up the line . I gotto verify if the boost controller is connected properly . Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 29, 2012 Author Share Posted September 29, 2012 (edited) I think my blitz SBC-ID II is installed wrong . according to mkiv technical articles the vsv needs both ports capped off and one of the outlets of the wastegate actuator needs to be capped off.(on mine all this is still connected up) looking at my picture above theyve used the old BOVs old connection line as the out connection (pressure reading is taken off this ) and the in is connected to the top of the no1 turbo wastegate actuator . maybe this is causing loss of pressure in the pressure tank that is causing what i describe above.hmmm definetly doesnt look correct ... Edited September 29, 2012 by muzzytt (see edit history) Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 30, 2012 Author Share Posted September 30, 2012 update Someone has disconnected the IN pipe to the pressure tank and put a screw in it to cap it off. Then they have put another line top the pressure tank wich then connects to the old bov line wich is then T'd to the pressure outlet in the Y pipe. You can see this in the picture above.! Ive reconnected the pressure tank the way its suppose to be. Currently plumbing the EBC the way its described in the mkiv site.. Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 30, 2012 Author Share Posted September 30, 2012 The pressure outlet out the 1st turbo wasn't connected to anything it was just uncapped ! Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 30, 2012 Share Posted September 30, 2012 Sounds like you might have discovered why things aren't working quite properly Quote Link to comment Share on other sites More sharing options...
listy Posted September 30, 2012 Share Posted September 30, 2012 Happy days. Hopefully that sorts the problem Quote Link to comment Share on other sites More sharing options...
muzzytt Posted September 30, 2012 Author Share Posted September 30, 2012 Yeah im hoping I just dont understand why they went top all that trouble? Essentially they were getting pressure reading directly from the IN port of the pressure tank! Im still tidying some areas like the intercooler pipe that was hitting the hole in the chassis. All the vibration against the chassis was eating into the intercooler pipe. It's common on these aftermarket coolers the hole is not big enough. Thanks for the ideas guys plus lots of research teaches alot! Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 30, 2012 Share Posted September 30, 2012 Following the pressure map of the Supra's sequential system is a tricky proposition. Garage monkies banging out jobs as fast as possible can end up with these situations as the complexity baffles them Quote Link to comment Share on other sites More sharing options...
muzzytt Posted October 2, 2012 Author Share Posted October 2, 2012 car feels much better THOUGH Ive hit a problem Im running the blitz sbc id3 and even with settings at zero once second turbo kicks in ive hit 20psi !!! Ive double checked the plumbing I have the pipe from the turbo pressure out nipple going to the solenoids IN and the pipe from the wastegate actuator going to the OUT of the solenoid. the first turbo is boosting to 10-11 psi but once we reach 3800 and the second turbo kicks in it just goes off the scale hitting 19 psi even though settings are at 0 on the controller hmm I must have missed something , so what controls the boost of the second turbo ? Quote Link to comment Share on other sites More sharing options...
muzzytt Posted October 3, 2012 Author Share Posted October 3, 2012 That's sorted bloody cap on wastegate came off! Now that everything is hooked up correctly ive tested the pressure tank by removing one of the hoses and no air is heard hissing out does this mean the tank is failed? Ive tested right after a run. The issue is the second turbo does come online its this sound change and flatness after a gear change say at 4000 rpm Quote Link to comment Share on other sites More sharing options...
muzzytt Posted October 4, 2012 Author Share Posted October 4, 2012 ive tested the pressure tank by taking off a hose on the iacv valve vsv and i did hear a hiss of air for about 2-3 seconds does this sound normal guys ? Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 6, 2012 Share Posted October 6, 2012 ive tested the pressure tank by taking off a hose on the iacv valve vsv and i did hear a hiss of air for about 2-3 seconds does this sound normal guys ? Sounds about right. It doesn't need to hold much pressure, just enough to push the valves open once or twice when off boost. Quote Link to comment Share on other sites More sharing options...
muzzytt Posted October 7, 2012 Author Share Posted October 7, 2012 Sounds about right. It doesn't need to hold much pressure, just enough to push the valves open once or twice when off boost. Thx mate! Quote Link to comment Share on other sites More sharing options...
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